GREEN FIRE (1954) starring Stewart Grainger, Grace Kelly, Paul Douglas, and John Ericson.
Prospector (Grainger) is hunting for emeralds on a Columbian mountain top. It overlooks the coffee plantation ran by siblings (Kelly and Ericson) and all are menaced by a big bandito and his group of small banditos. Add in a little romance, a bit of sibling rivalry, and a well done gigantic mountain slide and you have a decent little adventure.